title: Long-term human T-helper lines producing specific helper factor reactive to influenza virus.
mesh_terms: D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D002460:Cell Line; D002462:Cell Membrane / Q000276:immunology; D006801:Humans; D009980:Influenza A virus / Q000276:immunology; D007375:Interleukin-1; D009975:Orthomyxoviridae / Q000276:immunology*; D010641:Phenotype; D011506:Proteins / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D007375:Interleukin-1; D011506:Proteins